My cycles average about 26 days (with a 15 and a 38 at extreme ends). My first AF came 25 days after the d&c but it lasted about 12 days, mostly light spotting with two heavy bleeding early on. If I were to predict my second post m/c AF, it would be tomorrow or Tuesday but I get the feeling it might not come until later because of the 12 days of bleeding. I don't know exactly when I O'd because I wasn't actively charting. I remember having some EWCM around CD14.
Did your second AF come "on time"?
DS born 2009
BFP#2 ~ 8/2/11, EDD 4/11/12, D&C 9/12/11 at 9w5d
BFP#3 ~ 4/15/12, EDD 12/21/12 ~ DD born 12/22/12

Re: That second AF.....
BFP #1 6.19.11 ~ EDD 2.23.12 ~ CP on 6.22.11
BFP #2 7.23.11 ~ EDD 3.28.12 ~ MC on 8.16.11
BFP #3 11.17.11~ EDD 7.31.12 ~ MC on 1.18.12
BFP #4 4.12.12 ~ EDD 12.25.12~ Born on 12.26.12